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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-13
information. Otherwise, if some routers running the IGP protocol within this AS
have not learn about this route information, the data packets may be discarded for
these routers don’t know this route when these packets traverses through this AS,
namely, it will cause the route black hole.
The BGP-IGP synchronization is designed to ensure all routers within this AS can
learn the outbounding route information. A simple way is that the BGP Speakers
redistribute all of the routes learned by the BGP protocol to the IGP protocol,
guaranteeing that the routers within the AS learn such route information.
The BGP-IGP synchronization mechanism can be cancelled under two
conditions:
1. There is no the route information which pass through the local AS (In general,
this AS is an end AS).
2. All routers within this AS operate the BGP protocol and the full connection
relationship is established among all BGP Speakers (The adjacent relationship
is established between any two BGP Speakers).
Caution
By default, the synchronization is disabled. Enable synchronization when not all
the routers are running BGP when traversing an AS.
To enable synchronization of BGP speakers, execute the following operations in
the BGP configuration mode:
Command Function
DES-7200(config-router)#
synchronization
(Optional) Enable synchronization of
BGP and IGP.
Execute the no synchronization command to disable the synchronization
mechanism.
6.9 Configuring Interaction between BGP and IGP
To inject the route information generated by the IGP protocol into the BGP
protocol, execute the following operations in the BGP configuration mode:
Command Function
DES-7200(config-router)#
redistribute [connected | rip | static]
[route-map map-tag] [metric
metric-value]
(Optional) Redistribute static route,
direct route and the route information
generated by RIP.
DES-7200(config-router)# redistribute
ospf process-id [route-map map-tag]
(Optional) Redistribute the route
information generated by OSPF.